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Signal isolation transmission method and signal isolation transmission circuit

A technology of transmission circuit and transmission method, which is applied in the field of power converters, can solve the problems of large power loss, low transmission rate of transformers, and reduction of data transmission rate of transformers, etc., to achieve low transmission power consumption and increase data transmission rate.

Active Publication Date: 2018-09-11
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degaussing time is greater than or equal to the narrow pulse time transmitted by the transformer. The additional degaussing time reduces the data transmission rate of the transformer. The transmission period of the narrow pulse must be above 20ns, so the transmission rate of the transformer is lower than 50Mbps
In addition, the excitation of the magnetic core by the transformer when the narrow pulse is transmitted and the degaussing of the magnetic core after the narrow pulse transmission both consume energy, and the higher the transmission frequency of the transformer, the greater the power loss

Method used

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  • Signal isolation transmission method and signal isolation transmission circuit
  • Signal isolation transmission method and signal isolation transmission circuit
  • Signal isolation transmission method and signal isolation transmission circuit

Examples

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Effect test

Embodiment 1

[0046] Such as image 3 As shown, a detection circuit for signal isolation transmission includes a first transistor Q1, a first resistor R, a first capacitor C, a first Schmitt trigger, a first inverter, a first power ground GND, Supply voltage VCC. The base of the first transistor Q1 is connected to the first power ground GND, the emitter of the first transistor Q1 is connected to one end of the narrow pulse signal input pin, and the collector of the first transistor Q1 is connected to the first resistor R and the first capacitor C , the input end of the first Schmitt trigger; the other end of the first resistor R is connected to the supply voltage VCC; the other end of the first capacitor C is connected to the first power ground GND; the output end of the first Schmitt trigger connected to the input terminal of the first inverter; the output terminal of the first inverter is connected to the detection signal output pin. The power supply voltages of the first Schmitt trigge...

Embodiment 2

[0059] Such as Figure 5 As shown, it is the circuit diagram of the second embodiment of the present invention: replace the first transistor Q1 with the first N-type MOS transistor Q2, the gate of the first N-type MOS transistor Q2 is connected to the first power ground GND, the first N The source of the N-type MOS transistor Q2 is connected to one end of the second wire segment, and the drain of the first N-type MOS transistor Q2 is connected to the input end of the first resistor R, the first capacitor C, and the first Schmitt trigger; The rest of the connection methods are the same as the first embodiment, and its basic working principle is similar to that of the first embodiment.

Embodiment 3

[0061] Such as Figure 6 As shown, it is the circuit diagram of the third embodiment of the present invention: replace the first resistor R with the first P-type MOS transistor Q3, the gate of the first P-type MOS transistor Q3 is connected to the first power ground GND, the first P The source of the P-type MOS transistor Q3 is connected to the power supply voltage VCC, and the drain of the first P-type MOS transistor Q3 is connected to the collector of the first transistor Q1, the first capacitor C, and the input terminal of the first Schmitt trigger; the rest The connection mode is the same as that of the first embodiment, and its basic working principle is similar to that of the first embodiment.

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Abstract

A detection method, a signal isolation transmission method, a detection circuit, and a signal isolation transmission circuit. The present invention provides a detection method, comprising the following steps: receiving a voltage spike modulated into a narrow pulse through the emitter of the transistor Q1, and when the voltage difference between the voltage spike and the first power supply ground GND exceeds the turn-on voltage of the transistor Q1, the transistor Q1 Q1 is turned on to form a discharge circuit for the capacitor C in the detection circuit, so that the capacitor C discharges the charge, then the output signal of the Schmitt trigger is reversed from the first power supply ground GND to the power supply voltage VCC, and the output signal of the detection circuit is powered by the power supply The voltage VCC is reversed to the first power supply ground GND; when the voltage peak disappears, the transistor Q1 is turned off, forming a charging circuit for the capacitor C in the detection circuit, so that the supply voltage VCC charges the capacitor C through the resistor R, and the Schmitt trigger The output of the detector is reversed from the power supply voltage VCC to the first power supply ground GND, and the output signal of the detection circuit is reversed from the first power supply ground GND to the power supply voltage VCC. Compared with the prior art, the invention can greatly increase the data transmission rate, and can greatly reduce the product size under the premise of satisfying high isolation voltage.

Description

technical field [0001] The invention relates to a power converter, in particular to a detection method for an output feedback signal of a flyback converter, a signal isolation transmission method, a detection circuit, and a signal isolation transmission circuit. Background technique [0002] In most power systems based on the flyback converter topology, an optocoupler is usually used for isolated transmission of the output voltage feedback signal. The optocoupler transmits a continuous feedback signal, and it needs to consume a certain static bias current during normal operation, so its power consumption is relatively large, and the data transmission rate is lower than 1Mbps. While higher efficiency and higher speed optocouplers exist, they also cost more. [0003] Some power systems use transformers instead of optocouplers for isolated transmission of output voltage feedback signals, but transformers cannot directly transmit continuous feedback signals, and need to convert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0003
Inventor 肖华唐盛斌曾正球
Owner MORNSUN GUANGZHOU SCI & TECH
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